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Fig. 5. Means of binned rectified EMG traces of the external intercostal muscle
during (A) coupled walking: breathing and footfall in phase, (B) uncoupled
running relative to breath: the onset of expiratory airflow to the end of
inspiratory airflow and (C) uncoupled running relative to stride: one stride
length. Data are presented from Goose A averaged over 20 breaths or 20
strides. The external intercostal is a locomotor muscle and its activity
correlates with contralateral limb support.